*{
  margin: 0;
  padding: 0;
}

div{
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

.u-flex{
  display: flex;
  align-items: center;
  flex-direction: row;
}

.u-flex-col{
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.u-row-center{
  justify-content: center;
}

.u-col-center{
  align-items: center;
}

.u-height-f{
  height: 100%;
}
